(module
  (func (i32.const 100)
    (block $l1 (i32.const 200)
      (block $l2 (i32.const 300)
        (block $l3 (i32.const 400)
          (br 3) (br $l1) (br $l2) (br $l3)
          (drop)
        )
        (drop)
      )
      (drop)
    )
    (drop)
  )
)